style.css

* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

.container {
    width: 100%;
    min-height: 100vh;
    background-image: url(https://images.pexels.com/photos/5717479/pexels-photo-5717479.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1);
    background-size: cover;
    padding: 10px;
}
.todo-app {
    width: 100%;
    max-width: 540px;
    background: #cfc1ad;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
}

.todo-app h2 {
    color: #bb5959;
    display: flex;
    font-weight: 700;
    align-items: center;
    margin-bottom: 20px;
}

.todo-app h2 img {
    width: 30px;
    margin-left: 10px;
}
.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #edeef0;
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 14px;
}
button {
    border: none;
    outline: none;
    padding: 16px 20px; /* Reduced padding for mobile */
    background: #805d31;
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 40px;
    transition: background 0.3s; /* Smooth transition for hover */
}

button:hover {
    background: #704d28; /* Darker shade on hover */
}
ul {
    padding: 0;
}

ul li {
    list-style: none;
    font-size: 18px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
}

ul li::before {
    content: '';
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background-image: url(images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 12px;
    left: 8px;
}

ul li.checked {
    color: #8d4646;
    text-decoration: line-through;
}
ul li.checked::before {
    background-image: url(images/checked.png);
}

ul li span {
    position: absolute;
    right: 0;
    top: 5px;
    height: 40px;
    width: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
}

ul li span:hover {
    background: #edeef0;
}
@media (max-width: 540px) {
    .todo-app {
        margin: 20px auto; 
        padding: 20px; 
    }

    button {
        padding: 10px 15px;
    }

    input {
        padding: 8px; 
    }

    ul li {
        padding: 10px 8px 10px 40px;
    }

    ul li span {
        height: 30px; 
        width: 30px;
        font-size: 18px; 
    }
}